Results 71 to 80 of about 155,544 (195)
A UV-XUV attosecond beamline with few-femtosecond tunable ultraviolet pump pulses [PDF]
EPJ Web of ConferencesUltrafast charge transfer processes in organic materials which occur in organic materials are fundamental for advancing solar energy conversion technologies.
Colaizzi Lorenzo +10 more
doaj +1 more source
The Astrophysical JournalUniversal small-scale solar activity in the quiet region is suggested to be a potential source of solar wind and the upper solar atmosphere. Here, with the high-resolution 174 Å imaging observations from the Solar Orbiter/Extreme Ultraviolet Imager, we ...
Yadan Duan +4 more
doaj +1 more source
Enhanced Peak and Extended Cooling of the Extreme-ultraviolet Late Phase in a Confined Solar Flare
The Astrophysical JournalWe present observations and analysis of an X1.8 noneruptive solar flare on 2012 October 23, which is characterized by an extremely large late-phase peak seen in the warm coronal extreme-ultraviolet (EUV) emissions (∼3 MK), with the peak intensity over 1 ...
Shihan Li +5 more
doaj +1 more source
The Astrophysical JournalSolar quiet regions are divided into coronal hole regions (CH) and quiet-Sun regions (QS). The global magnetic field in CH is considered open to interplanetary space, while that in QS is closed.
Akiko Tei +2 more
doaj +1 more source
Fe xviii and Fe xx Forbidden Lines Observed by Solar Orbiter/SPICE
The Astrophysical JournalThe first simultaneous observations of the Fe xviii 974.86 Å and Fe xx 721.56 Å forbidden lines from the Spectral Imaging of the Coronal Environment (SPICE) spectrograph on Solar Orbiter are presented.
Peter R. Young +4 more
doaj +1 more source
On the Nature of Nonthermal Broadening of Spectral Lines Observed by IRIS
The Astrophysical JournalThe origin of nonthermal broadening in solar spectra is one of the long-standing questions in solar physics. Various processes have been invoked—including unresolved flows, waves, and turbulent processes—but definitive answers are lacking. To investigate
Kyuhyoun Cho +2 more
doaj +1 more source
Persistent Upflows and Downflows at Active Region Boundaries Observed by SUTRI and AIA
The Astrophysical JournalUpflows and downflows at active region (AR) boundaries have been frequently observed with spectroscopic observations at extreme ultraviolet passbands.
Yuchuan Wu +8 more
doaj +1 more source
A rotating tomographic imager for solar extreme-ultraviolet/soft X-ray emission
The Astrophysical Journal, 1992 A concept is presented for a high-resolution EUV/soft-X-ray imager that has much in common with the medical imaging procedure of tomography. The resulting instrument is compatible with a simpler, less costly spin-axis-stabilized spacecraft. To demonstrate the fidelity of the reconstruction procedure, the observation and reconstruction is simulated to ...
Joseph M. Davila, W. T. Thompson
openaire +1 more source
Response of Global Ionospheric Currents to Solar Flares with Extreme Ultraviolet Late Phases
The Astrophysical JournalIt is known that solar flares can affect the current system of the middle- and low-latitude ionosphere. Most earlier studies have focused on such effects during their impulsive phases.
Xuanqing Liu +7 more
doaj +1 more source
Carrington Maps in H i Lyα and Their Relationships with Extreme-ultraviolet and Magnetic-field Maps
The Astrophysical Journal LettersH i Ly α emission in the chromosphere and transition region is a key ingredient of the incident radiation to coronal neutral hydrogen for modeling corona Ly α emission.
Shuting Li +9 more
doaj +1 more source